PTGER1 and neoplasm: PTGER1 expression was examined in tumor samples from patients spanning the third to 10th decades of life against normal tissues, categorized into four age cohorts: (21-40 years) young adults, (41-60 years) middle-aged, (61-80 years) older adults, and (81-100 years) elderly; across racial groups (Caucasian, African American, and Asian) vs. normal; and by tumor stage (1-4), which included normal versus each stage of tumor comparisons, as well as pairwise evaluations among different pathological stages.